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Other (Income) Expense, Net
 3 Months Ended
Mar. 31, 2025
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 Three Months Ended
March 31,
($ in millions)20252024
Interest income$(109)$(73)
Interest expense313 303 
Exchange losses90 83 
Income from investments in equity securities, net (1)
(90)(143)
Net periodic defined benefit plan (credit) cost other than service cost(148)(160)
Other, net(91)(43)
 $(35)$(33)
(1)    Includes net realized and unrealized gains and losses from investments in equity securities either owned directly or through ownership interests in investment funds. Unrealized gains and losses from investments that are directly owned are determined at the end of the reporting period, while gains and losses from ownership interests in investment funds are accounted for on a one quarter lag.
Interest paid for the three months ended March 31, 2025 and 2024 was $233 million and $217 million, respectively.